Preservation of latex



YQUNIHTEDI STATES PATENT men? Joint uce'avacx, or .racxsort amen-rs, nnw !onx, assumes. no rm: nauca'rncx CHEMICAL COMPANY, HEC'IICUT Io Drawing.

This invention relates to methods of preserving latex of rubber or similar material, and particularl' bymeans of salts of selenious and tel urous acids. It also relates to the products thereof.

In general, materials that 'areused forpreservin latex fall into one of the following I,

of New Jersey, this classes. hose that have definite anti-coagulating properties; those that have definite antiseptic or germicidal properties; and those that have combined properties of preventing coagulation and putrefaction, one

' of the two properties being predominant.

Ammonia and formaldehyde are best known; the former belongs to the first named class .s., but-also retards putrefaction under certain conditions, and the latter gives preserving action without much increased stability and requires careful atl'on. v It has now been found thatthe soluble salts of selenious and tellurous acids, such as the alkali-metal salts; are efiective especially fromthe standpoint of coagulation, and when added to latex in'small amounts protect the v rnnsaavarron or Lara: p I Application'fled April 10, 1aae. semi a... amen.

ing the formula- H,XO, where X represents selenium or tellurium..

4. As anew material latex containing a small amount of an alkali metal salt of an acid having the formula H XO, where X represents selenium or tellrium.

Signed at Passaic, count of Passaic, State 12th a of A ril, 1929. JOHN KJCGA AGK.

procedure to prevent coagu- OF NAUGATUCK, CONNECTICUT, A COBPOMTIOH OI COH- latex against coagulation over a substantial period of time. 1 part of the salt to 1000 parts of latexwill preserve latex over a period of three months. 1

It is to be understood that the above proportion is not limiting, that varying proportions of small amounts of the described salts may be used. and it is not desired to limit the invention otherwise than as set. forth in the appended claims.

Having thus described my invention, that I to protect by Letters Pat-- I claim and desire ent is: v

1. The method of preserving latex which comprises adding to latex a small amount of a soluble salt of an acidhaving the formula HJCO where X represents selenium or tellurium. a I

2. The method of preserving latex which comprises adding to latex a small amount of an alkali-metal salt'of an acidhaving the Y formula H XO, where X or tellurium. 1 a p 3. As a new material latex containing a small amount of a soluble salt of an acid havrepresents selenium 

